For those wondering, this a DP-12, a double-barrel bullpup pump-action shotgun. The barrels are fired in sequence, with two pulls of the trigger required to fire both barrels. There is no "both at once" option.

The things on the front are either breaching muzzles, used to secure the shotgun against a door so it can be blown open, or chokes intended to adjust the spread of the shot.
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